The G3 Air/Fuel Ratio gauge (52mm, 2 1/16) features a high-speed stepper motor, through-dial backlighting, and an illuminated pointer. Each kit includes the gauge, an LC-1 wideband controller, oxygen sensor & bung/plug, and the award-winning LogWorks engine-tuning software. The industrys most accurate and fastest-responding wideband controller. One additional available analog output (one connects to the gauge). Easy set up and wiring (instructions included). LC-1 includes Innovate serial in & out for adding additional modular tuning system (MTS) components. (Gauge itself is analog only- no serial). Illuminated needle and through-dial backlighting. Blackout appearance when unpowered. Log directly from the LC-1s digital output into laptop w/included software.